Welcome: IDEALPLUSING

Department of news

Design and development of IDEALPLUSING pulse laser power supply

1718175458551559.jpg

1.Introduction

     Although the traditional pulse laser power supply has achieved nonlinearization and replaced the old linear voltage doubler rectification technology, the overall conversion efficiency, volume, weight, charge and discharge time and other important parameters have been greatly improved. In addition, the continuous improvement and productization of the reliability of nonlinear laser power supplies have brought the application of laser technology to a new level. However, this nonlinear laser power supply still has the disadvantage that the operating frequency has always been below 20kHz and cannot be further improved. This has led to the conversion efficiency, volume, weight and charge and discharge time of the traditional nonlinear laser power supply cannot be improved to the ideal state. At the same time, there is very annoying audio noise. In order to solve these problems, we have designed and successfully developed a nonlinear pulse laser power supply with an operating frequency of 100kHz.

 

2 Circuit composition

    The circuit schematic is shown in the figure.

 

200971583842391.gif


3 Working principle of the circuit

 

     3.1 Working principle of the trigger circuit

           As can be seen from Figure 2, the trigger circuit part is mainly composed of the trigger indication circuit and the trigger circuit, which are specifically completed by the LBI and LBO terminals of IC1, V1, LED, VD1, K1 and K2. When the converter charges the capacitor through the transformer T1, diodes VD2 and VD3, the sampling circuit (composed of R10, R9, W1, W2, W3, R1) feeds back its charging voltage value to the LBI and VFB terminals of IC1. Once the voltage is charged to the required voltage value (about 1kV), the voltage value of the LBI terminal will be greater than 1.3V, the LBO terminal will become a high level, V1 will be turned on, and the LED will light up, indicating that the voltage has been charged to a state that can be triggered. In addition, the sampling circuit sends the feedback signal to the VFB terminal of IC1. If the voltage value of the feedback signal is ≥1.3V, the converter is immediately turned off to maintain the high voltage at the required value. The trigger device is a high-voltage, high-current automotive-grade thyristor BT151/800R.

 

     3.2 Working Principle of Main Converter

           The main converter circuit is mainly a single-ended flyback boost circuit composed of IC1 (MAX641/642/643), transformer T1 and V2. The core part of the circuit is MAX641/642/643, so please refer to the literature [1] for the working principle analysis of this part of the circuit and the technical parameters and applications of MAX641/642/643. Here we only give the technical information of the high-frequency auto-coupling boost transformer for reference by colleagues when making it. The core uses 4kBEE type ferrite, and the frame uses EE19 type vertical frame corresponding to the core. Its technical parameters are shown in Figure.

 

54a8ad41-3fd7-42b4-bcfa-958bc2db7c6e.png


     3.3 Working principle of charging and discharging circuit

           The charging and discharging circuit is mainly composed of capacitors C7∥C10, C8∥C11, C9∥C12, C13, R14, step-up transformer T2, etc. When capacitors C7∥C10, C8∥C11, and C9∥C12 are charged to the set high voltage value, the voltage in capacitor C13 is also charged to the required voltage value (about 300V). At this time, K1 or K2 is closed, and thyristor V3 is triggered to turn on. The energy stored in capacitor C13 is discharged through the primary winding of transformer T2, so that the secondary winding induces a high voltage of about 10kV, ionizing the gas in the laser. At the same time of ionization, the energy stored in capacitors C7∥C10, C8∥C11, and C9∥C12 maintains the ionization process for a certain period of time, thereby obtaining the required laser pulse.

 

4 Selection and technical requirements of important components

 

     4.1 Energy storage capacitor Since the energy storage capacitors C7∥C10, C8∥C11, and C9∥C12 need to provide enough energy for the laser in a very short time, when selecting this capacitor, in addition to requiring it to have a sufficiently high withstand voltage (≥350V), it must also have the characteristics of fast charging and discharging, that is, a photoflash capacitor printed with "PHOTOFLASH" should be selected.

 

     4.2 Step-up transformer In addition to the primary winding of the step-up transformer supplying capacitor C13 to discharge so that the secondary voltage is increased to more than 10kV, it must also meet the requirement that after the gas is ionized, all the energy in the capacitors C7∥C10, C8∥C11, and C9∥C12 is released to the laser through the secondary winding so that a strong laser beam can be stimulated. Therefore, the secondary winding must have a large number of turns and a small resistance, and at the same time meet the requirements of high voltage resistance. The transformer core uses a 3kB toroidal ferrite material, the primary winding is made of ? 1.0 polytetrafluoroethylene silver-plated high-voltage wire, the secondary winding is made of ? 0.32 polytetrafluoroethylene silver-plated high-voltage wire, and the core magnetic ring uses a soft magnetic ferrite with an outer diameter of 35, an inner diameter of 12, and a thickness of 10. Its technical parameters are shown in Figure.

200971583842214.gif

CATEGORIES

CONTACT US

Contact:

Phone: +86-158-7657-0341

E-mail: market@jmhvpower.com

Whatsapp:+86-158-7657-0341

Add: Guangdong Province, China TianHe District, GuangZhou Num 899